Electric water heater



Patented Oct. 31, 1922.

CHARLES H. CARLSON, OF MINNEAPOLIS, MINNESOTA.

ELECTRIC WATER HEATER.

Application filed August 29, 1921. Serial No 496,233.

To all iii/10m it may concern:

Be it known that I, CHARLES H. OARLSON, a subject of the King of Sweden,residing at Minneapolis, in the county of Hennepin and State oiMinnesota, have invented certain new and useful Improvements in ElectricWater lleatcrs, of which the following is a specification.

My invention relates to electric water heaters. and an object to providea device of this character which may be conx eniently placed in a watersupply pipe so as to heat the water passing therethrough.

The full objects and advantages of my invention will appear inconnection with the detailed description, and the novel features en'iboded in my invention idea are particularly pointed out in the claims.

in the accompanying drawings which illustrate one of the embodimentswhich my invention may assume, Fig. 1 is an elevalional View of myelectric heater. Fig. 2 is a, view showing the heater in longitudinal.tion and the electrical connections diagrammatically. Fig. 3 is a viewin. section on the line 2-3-43 of Fig. 2. Fig. 4 is a view in s :tion onthe line -l4 oi Fig. 2.

As shown in the drawings my heater is connected to the pipes 10 and 12of any suitable or customary water supply system, the pipe it) being theinlet pipe to the heater and the pipe 12 being the outlet from theln-aier. 'Ehe pipes 10 and. 12 are coupled to; l 'ier by a pipe section14. Lying within the section l t and spaced from the inner wall thereofis a copper shell 1.6 which has a closed end The opposite end of thisshell is shown with an enlarged portion 19 which is threaded at 20 intothe section 14;, while the extreme end of this enlarged portion isthreaded into a metallic sleeve 22. The shell l6 when in place isairtight and air is exhausted from the same. Lying within the shell 1.6and spaced from the inner wall the eof is a carbon rod 24, one end oiwhich rests a ainst the end 18 of the shell, and the other end of whichis held in a socket formed in a metallic rod 26 which is slidahlymounted in bushings 28 and 30 of insulating material. A coiled spring 32sur rounding the rod 26 between the bushings and 30 serves to maintainthe free end of the carbon rod 24: in contact with the closed end 18 of:the copper shell. A wire 34: is connected to a lug on the sleeve 22 anda wire 36 is connected to the outer end of the rod 26 by a clamp 38 andthe connections of these wires are protected by a fiber sleeve 420secured to and extending out from the sleeve 22. The outer ends of thewires 34.- and 36 are connected to a transformer coil 12, the other coil44; of the transformer joining wires d6 and 48 which supply current fromany suitable source of electrical energy. By means of the transformer,the voltage ot' the supply current may be greatly rediiced. A. switch 50may be placed at any desired place in the circuit of the wires 46 and41-8.

The operation and advantages of my invention will be obvious from theforegoing description. My heater may be installed at any convenientplace in the supply pipe of a water system. ll hen the switch 50 isclosed, the reduced current from the trans- TOFIDGI passes from the wire36 through the rod 26 to the carbon rod 24 which is highly heatedthereby and, hence, heats up the cop per shell 16 through which thecurrent re turns to the wire 34;. ater entering the heater througl'i thepipe 10 passes around the shell 1.6 by means of which it is quicklyheated and the hot water flows out through the pipe 12 to the desiredplace where it is to be used.

l claim:

1. An electric water heater.comprising a pipe section adapted to beplaced in a water supply pipe. a metallic shell spaced within said pipesection. a carbon rod spaced within said shell and having one end incontact therewith, and an electrical circuit connected with said carbonrod and said shell.

2. An electric water heater comprising a pipe section adapted to beplaced in a water supply pipe, a metallic shell spaced within said pipesection. a carbon rod spaced within said shell. resilientmeans forholding an end of said carbon rod in contact with said shell, and anelectrical circuitconnected with said carbon rod and said shell.

An electric water heater comprising a pipe section adapted to be placedin a water supply pipe, a metallic shell spaced within said pipe sectionand having one of its ends closed and its other end secured to saidshell, a carbon rod spaced within said shell. spring for holding one endof said carbon rod in contact with said closed end. and an electricalcircuit connected with said carbon rod and said shell.

4}. An electric water heater comprising a pipe section adapted to beplaced in water L. W. CHUBB.

ELECTRICAL PRECIPITATING SYSTEM.

APPLICATION FILED 020.14, 1918.

1,433,699. Patented Oct. 31, 1922.

r Fig. 5

WITNESSES: INVENTOR fQ L ew/Qs' Warr/h fon C/Wbb.

ATi'ORNEY

